Multi-Panel CSI Reporting Using Reduced PMI Matrix Indices
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel state information (CSI) due to resource shortages and the need for higher-speed services, particularly in supporting massive data traffic, increased transfer rates, and low latency, which is complicated by the complexity of beamforming in multi-panel systems.
Innovation Solution
A method for user equipment (UE) to measure and report CSI by using a new codebook and report configuration that includes specific matrix indices for phase calibration between panels, reducing the overhead and complexity of CSI feedback by incorporating only necessary matrix indices in the precoding matrix indicator (PMI) and channel quality indicator (CQI).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI reporting includes all matrix indices for phase calibration between panels, then beamforming accuracy is improved, but reporting complexity and overhead increase
Solution Approach 1:
The patent extracts only the necessary matrix indices (first matrix index for wideband panel compensation and second matrix index for subband panel compensation) from the complete set of possible matrix indices. By taking out only the essential indices needed for beamforming while excluding redundant phase calibration indices, the solution achieves beamforming accuracy without the full reporting overhead, thus resolving the contradiction between precision and complexity
Solution Approach 2:
The patent applies partial action by reporting only a subset of matrix indices (first and second matrix indices) rather than all possible matrix indices for phase calibration. This partial reporting approach provides sufficient information for beamforming operations while avoiding excessive reporting complexity, effectively balancing the trade-off between measurement precision and device complexity
2Measurement precision
If CSI measurement is performed on all configured CSI-RS resources, then measurement accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies partial action by requiring the user equipment to perform CSI measurement on only a subset of CSI-RS resources (at least one CSI-RS resource) rather than all configured resources. This partial measurement approach maintains adequate measurement accuracy for beamforming while significantly reducing processing time and computational load, thus resolving the contradiction between measurement precision and time loss
Data Source
AI summary
Systems and techniques for reporting channel state information (CSI) in a wireless communication system and a device therefor. Particularly, a method for reporting channel state information (CSI) of a terminal in a wireless communication system can include the steps of: measuring a CSI reference signal (CSI-RS) transmitted by means of multi-panels from a base station; and reporting CSI, which is generated on the basis of the CSI-RS measurement, to the base station. If the terminal receives, from the base station, configuration of a CSI report excluding a matrix index for phase calibration between panels, the CSI includes only a first matrix index, for wide-band (WB) panel compensation, and a second matrix index, for subband (SB) panel compensation, and can be calculated by means of the first matrix index, the second matrix index and a particular matrix index associated with the phase calibration between the panels.